Telephone-signal.



No. 897,119. v PATENTED AUG. 25, 1908.

c. MAHLER. TELEPHONE SIGNAL.

APPLICATION FILED APR. 27.1907.

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CHARLES MAHLER, OF SEW YORK, N. Y.

TELEPHONE-SIGNAL.

sofas-2,119.

Specification of Letters Patent. Application mm ei ru 27, 1907. sq-m No.370,610.

Patented Au ust, 1908.

To all whom it may concerns having a rearwardly extending arm and Be itknown that I, CHARLES MAnLER, a upwardly extending s ring arm 7,terminatcitizen of the United States, residing at the I borough ofBrooklyn, New York city, in the county of Kings and State of New York,have invented certain new and useful Ini rovements in T elephonesignals, of which t 1e following is a s cification.

My inventul'n relates to signals for telephone switchboards. V

The object of my invention is to equip atelephone switchboard with aseries of audible s gnals, each operated separately and each connectedwith its respective branch line or telephone. Each audible signal hasits own distinct and peculiar tone, differing from the tones of theother signals in the series.

B the use of my invention the operator at tile switchboard is enabled toknow what branch line or telephone requires the imme- An audible clickor signal has usually been.

nals before him to ascertain the source of the Y call. My invention, bcombining with the audible signal means or indicatin thereb the sourceof the call dispenses with this 81 ditional or secondary observation ofthe operator.

By he use ofmy invention, blind opera tors or those having defectiveeyesight may be employed at tele hone switchboards, thus providing suchu ortunate persons with a new field for earning avlivelihood.

In the drawin Figure 1 is a front-i icw of a portion of a switchboardshowing themanher in which my device is secured thereto. Fig, 2 is aside view of the operative parts of one of the audible signals. Fig. 3is a view vsimilar to Fig. 2, showing a modification.

In the drawin 1 is the front of theswitchboard, across w iich extendsthe cross-bar 2. Extending from the cross-bur 2 and secured thereon is aseries of uprights 3, each carrying. an audible signal or hell 4.Mounted upon the cross bar 2 behind each bell 4 is an L shaped lever 5,pivoted upon the pin 6,-

ing in a ball 8. At t ie rear of each bell is mounted a magnet 9, whichwhen energized so attracts an armature 10, pivo ed at 11 and having theforwardly extending arm 12 adapted to be thrown upward against he L-shaped lever 5 and to sound the bell'4, when the armature 10-is drawnrearwardly by the 5':- nm et 9. In the modification illustrated", by ig.3, the L shaped lever 5 is dis ensedwith. Projecting reanvardly from t eiv-- oted armature 10 and. connected thereto is the ring arm 13terminating in-the ball1'4 7o whisl i is adaptedto strike against thebell 4 when-the armature 10 is drawn towards itse operation ofthedeviceis as follows? Each of the series ofelectro-magnetsi 9 isj7'5adapted tobe energized by the removal ofthe receiver of abranchtelephone fi'om'its normal support in the usual way. When an" electromagnet 9 is-energized it will attract" its armature 1D and throw upwardthefor- 3'0 wardly projecting arm 12 which will strikeagainst the I.shapedleverh throwing the ball 8 against the bell'4. Each branch tele-"phone is connected'with'its individual elec tro magnet 9 adapted toringits correspond- 35 ing bel 5 of the series. As indicated in Fig;

1', the bells date of difierent'sizes and'tones' so that the sounding ofone hell will indicate to the operator who has learned'the series oftones what branch telephone desires com-- munication. The tones of thebells may arran ed in musical scale or otherwise so dif ferentlated'that the operator may readily; recognize the distinctions in'sound."Eac' spring arm 7 shouldbe so adjusted'that it will spring out ofcontact with its hell 4 in'1-' niediately after its blow has beendelivered.-

In the modification illustrated by Fig. the upward movement of thespring arm 13 carries the ball 14 against the hell 4 and the adjustmentof the spring 13 throws the ball l4 away from the bell 4 after the blowhas been struck. y

i device may, of course, be employed in" connection with the usualvisiblesi als in which case the sounding of the audib e signal; and theappearance of the visible signal will be simultaneous.

My device mav be conveniently installed on switchboardslof theusual'type having'llo" visible signals byTositioning the cross bar- 12and parts carried thereby so that the a'ddiblo signals may be operatedin the 115-1511 F 5.1m by 115 imlh idual oim-t'm-mngnqt to ring visibli;signals ahead) on ihv swi'tuhbumvl.

\Yuni l pflulm as new and v Lviivrs Patent 1s:

(loam-magnets individuzd in. mu'h branch l-PlCPhnUO, i1 porrcspundingsvrivs of 'huHs of (liflerex'n individual tones, and a mrrvqkundingsuricbi of lovers each zulupiul to be autullvsirc to secure I 1'.) mu ufTh0 luHs in said sm'ivh. I

Signed at New York vii in the mum) of E New York and Sum of New Yurkthis 26th (1:1 of April A\.]). 13)!)7.

CHARLES MAHLER. filnvssvs:

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